linux-kernel - [RESEND PATCH] drm/hisilicon: Ensure LDI regs are properly configured.

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Message-Id: <1502806465-17772-1-git-send-email-peter.griffin@linaro.org>
Date:   Tue, 15 Aug 2017 15:14:25 +0100
From:   Peter Griffin <peter.griffin@...aro.org>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        z.liuxinliang@...ilicon.com, zourongrong@...il.com,
        kong.kongxinwei@...ilicon.com, puck.chen@...ilicon.com,
        airlied@...ux.ie
Cc:     john.stultz@...aro.org, dri-devel@...ts.freedesktop.org,
        andrey.konovalov@...aro.org, guodong.xu@...aro.org,
        shawn.guo@...aro.org, Peter Griffin <peter.griffin@...aro.org>,
        stable@...r.kernel.org
Subject: [RESEND PATCH] drm/hisilicon: Ensure LDI regs are properly configured.

This patch fixes the following soft lockup:
  BUG: soft lockup - CPU#0 stuck for 23s! [weston:307]

On weston idle-timeout the IP is powered down and reset
asserted. On weston resume we get a massive vblank
IRQ storm due to the LDI registers having lost some state.

This state loss is caused by ade_crtc_atomic_begin() not
calling ade_ldi_set_mode(). With this patch applied
resuming from Weston idle-timeout works well.

Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
Tested-by: John Stultz <john.stultz@...aro.org>
Cc: stable@...r.kernel.org
---
 drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
index c96c228..72c6357 100644
--- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
+++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
@@ -519,9 +519,12 @@ static void ade_crtc_atomic_begin(struct drm_crtc *crtc,
 {
 	struct ade_crtc *acrtc = to_ade_crtc(crtc);
 	struct ade_hw_ctx *ctx = acrtc->ctx;
+	struct drm_display_mode *mode = &crtc->state->mode;
+	struct drm_display_mode *adj_mode = &crtc->state->adjusted_mode;
 
 	if (!ctx->power_on)
 		(void)ade_power_up(ctx);
+	ade_ldi_set_mode(acrtc, mode, adj_mode);
 }
 
 static void ade_crtc_atomic_flush(struct drm_crtc *crtc,
-- 
2.7.4